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The ePub one sounds like an error on the part of the document creator - I'd request a refund from the publisher.
The PDF case is more problematic. It is, from your description, more than like a case of a PDF document for which "reflow" doesn't work very well. PDF was never intended to be an eBook format and generally doesn't do at all well at it. It's far better to buy in virtually any other format than PDF if you can possibly help it.
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